Question

3 задание. . . . . .......

Answer 1

370-320+150-90
320+50-60+70

Answer 2

1) (370-320)+(150-90)=50+60=110
2)(320+50)-(60+70)=370-110=260
3)(620+30)-(670-50)=650-620=30
4)(780-720)+(960-560)=60+500=560